Configuring the Switch
3-40
Displaying RSTP Status
Use the RSTP Status page to display global and port-specific status and attribute
settings for the Rapid Spanning Tree Protocol.
Field Attributes
RSTP Bridge Overview
• Hello Time – Interval (in seconds) at which the root device transmits a
configuration message.
• Max Age – The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure. All device ports (except
for designated ports) should receive configuration messages at regular intervals.
Any port that ages out STA information (provided in the last configuration
message) becomes the designated port for the attached LAN. If it is a root port, a
new root port is selected from among the device ports attached to the network.
• Fwd Delay – The maximum time (in seconds) the root device will wait before
changing states (i.e., discarding to learning to forwarding). This delay is required
because every device must receive information about topology changes before it
starts to forward frames. In addition, each port needs time to listen for conflicting
information that would make it return to a discarding state; otherwise, temporary
data loops might result.
• Topology – Indicates if spanning tree topology is steady or undergoing
reconfiguration. (The time required for reconfiguration is extremely short, so no
values other that “steady” state are likely to be seen in this field.)
• Root ID – The priority and MAC address of the device in the Spanning Tree that
this switch has accepted as the root device, and the port connected to the root
device.
RSTP Port Status
• Port/Trunk – The number of a port or the ID of a static trunk.
• Path Cost – The cost for a packet to travel from this port to the root in the current
Spanning Tree configuration. The slower the media, the higher the cost.
• Edge Port – Shows if this port is functioning as an edge port, either through
manual selection (see the RSTP Port Configuration table) or auto-detection. Note
that if the switch detects another bridge connected to this port, the manual setting
for Edge Port will be overridden, and the port will instead function as a
point-to-point connection.
• P2P Port – Shows if this port is functioning as a Point-to-Point connection to
exactly one other bridge.
The switch can automatically determine if the interface is attached to a
point-to-point link or to shared media. If shared media is detected, the switch will
assume that it is connected to two or more bridges.
• Protocol – Shows the spanning tree protocol functioning on this port, either RSTP
or STP (that is, STP-compatible mode).
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